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What did you make in grade five for the Science Fair?

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I made a 2 bit alu (4 inputs) that worked by dropping marbles in top and each option flag was a little lever that was either 1 or 0 as indicated by a pull flag.

This is around the time I got into trying to build a working calculator...never even got past the blueprint tho.
 
In 4th grade I created "Liquid Rock Salt" but I forget the clever name I gave it... guess what the city of cleveland started using on its roads a few years back... liquid rock salt! BAH!
 
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